Keywords
angina pectoris; cholecystitis; cholelithiasis; diagnosis; etiology; internal medicine; thorax pain; adolescent; adult; aged; angina pectoris; article; cholecystitis; cholelithiasis; differential diagnosis; electrocardiography; human; Adolescent; Adult; Aged; Angina Pectoris; Cholecystitis; Cholelithiasis; Diagnosis, Differential; Electrocardiography; Human; Middle Age